Description:
The KIA7818A is a three-terminal positive fixed voltage regulator manufactured by KEC (Korea Electronics Corporation), designed to output a stable, regulated 18V from an unregulated DC input. Part of KEC's 78xx-series regulator family, it's built for straightforward, drop-in voltage regulation in a wide range of analog and digital circuits, including C-MOS, TTL, DTL, and HTL power supply applications.

The device includes internal thermal overload protection and internal short-circuit current limiting, making it robust against overheating and output faults during operation. It can supply an output current in excess of 1A, and requires only minimal external components (typically a couple of capacitors) to function reliably in a circuit.

This particular unit is housed in a TO-220F (isolated) package — a fully-insulated variant of the standard TO-220 outline, allowing direct mounting to a heatsink without a separate insulating pad, which simplifies board assembly while keeping the mounting tab electrically isolated from the circuit.

Key Specifications:

• Manufacturer: KEC (Korea Electronics)
• Part Number: KIA7818A
• Type: Fixed Positive Voltage Regulator
• Output Voltage: 18V
• Output Current: Up to 1A (1.5A on some variants)
• Package Type: TO-220F (3-Pin, Isolated, Through Hole)
• Protection Features: Internal thermal overload protection, internal short-circuit current limiting
• Equivalent To: NTE1974

Applications:
General-purpose 18V DC power regulation, on-board voltage regulation for logic families (C-MOS, TTL, DTL, HTL), power supplies, and embedded electronic systems requiring a stable 18V rail.

Package Includes:

• 1 x KEC KIA7818A Voltage Regulator (TO-220F)